Life span, sue a lot here seam to only use a card for a few months to a year but the gtx 460 isn't a card for someone who expects a long life that upgrades every two or three years. The lack of cooling on the gtx 460 for the power vrm and vram in some situations can drastically shorten the life of card but in general it will not last like most cards not when the power vrm can easily go over 100c. The gtx 560 ti is a fully enabled version of the gtx 460 but uses less power per clock and has what the vast majority of the gtx 460 out there does not cooling in those critical areas through the use of the mid plate. For aesthetic reasons the gtx 560 ti will look better as the pcb will remain straight and not sag as some cards tend to do after they have aged. A typical gtx 460 can hit 850mhz core with some going over 900mhz but few reach 1ghz. The gtx 560 ti at the lowest can overclock to 920mhz easily while from there top out under 1ghz. A few can get a hair over but none reach 1.1ghz without major modifications.
That's great. I was hoping upgrading my GPU would extend the life of my PC for a few more years. Thanks for the detailed explanation.